Effects of intestinal ischemia on in vitro activity of adjacent jejunum in samples obtained from ponies
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Effects of intestinal ischemia on in vitro activity of adjacent jejunum in samples obtained from ponies
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2001
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American Journal of Veterinary Research
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Article
Abstract
Objective—To determine whether intestinal ischemia would alter activity of the jejunum in vitro or alter staining characteristics for certain types of enteric
neurotransmitters.
Sample Population—Jejunal samples obtained from 10 ponies.
Procedure—Jejunal samples were obtained from locations proximal and distal to an area of small intestine made ischemic for 60 minutes. A portion of each sample was stained to detect substance P-like immunoreactivity, cholinergic and adrenergic neurons, and nitric oxide synthase. Portions of the
remaining samples were suspended in muscle baths. General activity patterns (frequency and amplitude of contraction), responses to neuronal depolarization induced by electrical field stimulation (EFS), and responses to 1 μM norepinephrine (NE) were compared with responses of a normal section of small intestine obtained prior to ischemic insult.
Results—Staining patterns were not altered. Proximal and distal sections had evidence of decreased contractility, compared with the normal section. Contraction frequency also was decreased, and distal sections had lower contraction frequency than proximal sections. Relaxation responses were
decreased in distal sections. Responses to NE differed significantly for distal and proximal sections, compared with normal sections.
Conclusions and Clinical Relevance—Short-term ischemia can significantly affect adjacent bowel. Contractile and relaxation responses are impaired.
Discrepancies in intestinal motility patterns and alterations in response to NE for sections proximal and distal to ischemic intestine could lead to clinical ileus or slowed transit of ingesta.
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Am J Vet Res 2001, 62:1973-1978
Suggested citation
Malone, Erin D; Kannan, Mathur S. (2001). Effects of intestinal ischemia on in vitro activity of adjacent jejunum in samples obtained from ponies. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/202623.
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